Delete row 478482 from events

seq 478482
id evt_0302e84e34ba
kind signal_ingest
ts 2026-04-22T03:17:06.032274+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-22T03:03:32.063 ...
source_ref candidate:sc_4d6027d91fff00ff
confidence 0.72
dedupe_key signal_enriched:discovery_sec_filing_delta:b265cec ...
episode_id NULL
created_at 2026-04-22T03:17:06.032349+00:00
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